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''Warning! Character sheets are spoilerific.''
!The Plastics


[[folder: As a Whole]]

* BlondeBrunetteRedhead: After Cady enters, and especially after [[spoiler:Regina leaves]].
* GirlPosse: They're the titular mean girls that rule the school.
* LargeAndInCharge: The two dominant members (Cady and Regina) are noticably taller than the two followers (Gretchen and Karen.)
* PoliticallyIncorrectVillain: They have no qualms about branding Janis a "dyke," and Regina uses the word "retarded" casually in her first on-screen conversation.
* SexySantaDress: In their "Jingle Bell Rock" routine that they do for the Winter Talent Show (which, according to [[GayBestFriend Damien]], they do every year).
* WithFriendsLikeThese: Except for [[HeterosexualLifePartners Gretchen and Karen]], towards one another.

[[folder: Cady Heron]]

!!Cady Heron (Creator/LindsayLohan)

[[caption-width-right:250:(narrating)'' ''':''' ''I know it looked like I was being a [[AlphaBitch bitch]], but that's only because I was ''[[BeneathTheMask acting]]'' [[BecomingTheMask like a bitch.]]]]

* AlphaBitch: After BecomingTheMask
* BecomingTheMask: She pretends to be an AlphaBitch to get on Regina's good side. Then she really becomes one.
* BeneathTheMask: She's just as capable of being a bitch as anyone.
%%* DiggingYourselfDeeper
%%* EatingLunchAlone
%%* FaceHeelTurn
%%* FieryRedhead
%%* FromNobodyToNightmare
%%* HeWhoFightsMonsters
* HomeSchooledKids: Until the beginning of the movie, Cady had never gone to a regular school and had been homeschooled since she was around four years old.
%%* TheMole
%%* NaiveNewcomer
%%* NerdsAreSexy
%%* NoSocialSkills
%%* RedHeadedHeroine
* ObfuscatingStupidity: She pretends to be terrible at math so that she can study with Aaron.
* ThePawn: For Janis to use to ruin Regina George's life.
* TheStarscream: To Regina.
* TookALevelInJerkass: The more she spends time with the Plastics.
* TragicHero: Actually manages to be a near-textbook example.
%%* WhatTheHellHero

[[folder: Regina George]]

!!Regina George (Creator/RachelMcAdams)
[[caption-width-right:250:"You know what people say about you? They say that you're a homeschooled jungle freak who's a less hot version of me!"]]

%%* AlphaBitch
%%* BigBad
* BitchInSheepsClothing: Although she doesn't bother with it for long she can seem nice enough at first if she wants to.
%%* BlondesAreEvil
* ButtMonkey: Regina George, the butt of all of Cady's tricks and pranks. [[{{Jerkass}} She probably deserves it, though.]]
%%* CantGetAwayWithNuthin: You KNOW it's true.
* TheChessmaster: Comes up with her plan to get revenge on Cady and throw the entire school into chaos in the course of one screaming car ride home.
%%* EvenTheGirlsWantHer
* HeelFaceTurn: At the end.
* HiddenDepths: Oddly enough, she seemed genuinely surprised and hurt when she realizes how much her schoolmates and even her teachers dislike her.
* JerkWithAHeartOfGold: Turns into this.
%%* LargeHam
* LovableAlphaBitch: Post HeelFaceTurn (made much more apparent in the original script.)
%%* ManipulativeBitch
* MeaningfulName: "Regina" means "queen".
%%* RichBitch
* RichInDollarsPoorInSense: Regina's a specific example. She could rattle off several mostly-illegal weight loss drugs (most of which either were expensive before being banned or would be expensive to ship from countries where they're still legal). Yet, she didn't know enough about health and nutrition to know whether or not butter is a carb. This is most likely a jab at the stereotype of American teenage girls wanting to get thin or in shape the fast and ''un''healthy way than through actual ''healthy'' living.
%%* ShroudedInMyth
%%* SmugSnake
%%* SpoiledBrat
* TwistingTheWords:
--> '''Regina''': You're, like, really pretty.
--> '''Cady''': Thanks.
--> '''Regina''': So you agree?
--> '''Cady''': What?
--> '''Regina''': You think you're really pretty?
* VillainousBreakdown:
** When she realizes that Cady deliberately made her gain weight. But then she recovers almost immediately and turns right back into the Chessmaster.
** After Janis humiliates her in front of the school by revealing her ploy with Cady, Regina begins suffering another breakdown. This time, it is cut short [[spoiler: [[LookBothWays by a school bus]]]].

[[folder: Gretchen Weiners]]

!!Gretchen Weiners (Creator/LaceyChabert)

[[caption-width-right:250:"That is so fetch!"]]

* BetaBitch: She appears to be this to Regina initially.
* CatchPhrase: "That is so fetch!"
* EveryoneIsChristianAtChristmas: Despite the fact that Gretchen's Jewish, she performs Jingle Bell Rock, which is a Christmas song, with the other Plastics every year for the Winter Talent Show.
%%* ExtremeDoormat
* HeelFaceTurn: At the end.
* HeterosexualLifePartners: With Karen.
* HiddenDepths: She [[spoiler: confesses to Cady that she's secretly miserable as Regina's friend and has to pretend to like and not like certain things in order to gain Regina's approval]].
* InformedJudaism: At one point, she mentions receiving Hanukkah presents from her parents.
* MinionWithAnFInEvil: Not as much as Karen, but still rather incompetent in bitchiness and actually seems [[LovableAlphaBitch fairly nice]].
* {{Neologizer}}: Primarily in the form of "fetch". Which will never catch on.
* SoBeautifulItsACurse: "I'm sorry that people are so jealous of me...but I can't help it that I'm so popular."
%%* StepfordSmiler
* VillainousBreakdown: '''"WE SHOULD TOTALLY JUST STAB CAESAR!!!"'''
* WhatCouldHaveBeen: Gretchen was originally meant to be a plain and frumpy girl whom Regina only kept around because her parents were so rich. Naturally this trait was thrown out completely when Lacey Chabert was cast. The script, however, still has a few places where Regina claims no one finds Gretchen attractive.
%%* {{Yandere}}


[[folder: Karen Smith]]

!!Karen Smith (Creator/AmandaSeyfried)

[[caption-width-right:250:"So if you're from Africa... why are you white?"]]

* AdvertisedExtra: Karen doesn't have that large of a part (especially compared to the other three plastics) and has little impact on the plot, but is featured in all of the advertisements because she is a Plastic and thus one of the Mean Girls.
* BlondesAreEvil: Subverted; she's pretty nice mostly and is easily the least malicious of the Plastics (Cady included.)
* BrainlessBeauty: One of the iconic examples!
%%* {{Cloudcuckoolander}}
* TheDitz: Stands in the rain, feeling her breasts (see InformedAbility below), and declares that "there's a 30% chance that it's already raining!" With complete sincerity.
%%* DumbBlonde
%%* DumbIsGood
* GoodBadGirl: See ReallyGetsAround.
* HeelFaceTurn: At the end.
* HeterosexualLifePartners: With Gretchen.
* InformedAbility: Apparently, her breasts can tell when it's going to rain. Or at least, when it's ''already'' raining. And even then, she's not ''completely'' sure, even if she's actually OUTSIDE in the rain.
%%* KindHeartedSimpleton
%%* KissingCousins
%%* MinionWithAnFInEvil: Oh yes.
* ThePollyanna: As well as being the least malicious Plastic she's easily the happiest too, lacking Regina's rage, Gretchen's crippling neurose, or Cady's need to fit in. She's even aware of (and comfortable with) the knowledge she's not very bright.
* ReallyGetsAround: Somewhat of an InformedFlaw, but she has a reputation and is perfectly willing to hook up with her cousin.
%%* SatelliteCharacter
%%* TokenGoodTeammate


[[folder: Ms Sharon Norbury]]

!!Ms. Sharon Norbury (TinaFey)

[[caption-width-right:250:"You girls have got to stop calling each other sluts and whores, because if you do, it makes it okay for ''guys'' to call you sluts and whores."]]

%%* BrainyBrunette
* CoolTeacher: Sometimes.
-->'''Cady''': ''(stating why she can't go to the dance)'' I'm grounded.
-->'''Norbury''': You're already out.
* ClearMyName: Actually, Cady ''confesses'' that she was the one who said that she had drugs in her house.
%%* CreatorCameo
%%* HotTeacher
%%* ReasonableAuthorityFigure

[[folder: Janis Ian]]

!!Janis Ian (Creator/LizzyCaplan)

[[caption-width-right:250:"...And evil takes a human form in Regina George. Ah, now don't be fooled. Because she may seem like your typical selfish, backstabbing, slut-faced ho-bag, but in reality, she is so much more than that."]]

* AmbiguouslyGay: Is Janis Ian a lesbian? Damn hard to say. [[spoiler: It's proven she's not a lesbian when she starts dating [[ProudToBeAGeek Kevin]] at the end of the movie]].
%%* BrainyBrunette
* TheChessmaster: Janis masterminded a plan to ruin Regina George's life using Cady as ThePawn to do so.
%%* CoolLoser
%%* DeadpanSnarker
* FallenPrincess: Janis used to be popular, but her reputation was destroyed by a rumor and she now willingly embraces outsiderdom.
%%* FormerFriendOfAlphaBitch
* HeelFaceTurn: At the end.
* ImportantHaircut: Offscreen. After Regina spread the rumor in middle school that Janis was a lesbian, Janis dropped out of school for the rest of the year; when she returned in the fall, "all her hair was cut off, and she was totally weird."
%%* JerkWithAHeartOfGold
* KarmaHoudini: Janis, who, despite influencing and encouraging Cady to join the Plastics specifically to damage Regina, gets zero comeuppance when she reveals it to the entire crowd of girls following the revelation of the Burn Book.
* ManipulativeBitch: Janis convinces Cady to join the Plastics just so she can information from them.
* NotSoDifferent: Aside from her JerkWithAHeartOfGold tendencies and her want for revenge against Regina, [[YouAreWhatYouHate she's just as spiteful and manipulative as she is when it comes to Cady]].
* PayEvilUntoEvil: Her vendetta against Regina.
* PlatonicLifePartners: With Damian.
* VillainousBreakdown: When she realizes that Cady has [[BecomingTheMask become the mask]].

[[folder: Damian]]

!!Damian (Daniel Franzese)

[[caption-width-right:250:"And I want my pink shirt back. I WANT MY PINK SHIRT BACK!"]]

* CampGay: Damian is "too gay to function," though to be fair he's only ''mildly'' flamboyant.
%%* DeadpanSnarker
* TheDragon: To Janis.
* GayBestFriend: To Janis and later, Cady.
%%* HaveIMentionedIAmGay
%%* NiceGuy
* PaperThinDisguise: A RunningGag.
* PlatonicLifePartners: With Janis.

[[folder:Principal Duvall]]

!!Principal Duvall (Tim Meadows)

* BatterUp: When he discovers the students are fighting, [[LetsGetDangerous he grabs his baseball bat]] before going out and breaking up the commotion.
%%* BewareTheNiceOnes
%%* ButtMonkey
%%* ReasonableAuthorityFigure
%%* TranquilFury